Samuel



S. G. CABELL. NAUTICA'L ALARM-Bums.

Patented Aug. 14.-,18'77.A

N.PETERS, PHOT0L|THOGRAPHER, WASHINGTON. DV C.

srriufuEL Gf caan Teeuwenirme-atea y. `*Be* kn` "n-fthatf-I-,SMUEL'G AB 1, p the DSEI'CL Of Golum'biafWa's'hi'u gt'ou ic'ounty# haveinventedbertain new and useful vImproveniente in Nautical Alarm -Buoys'f'of which the followingis a specification This invention-isau v'improvemeut' `upon an alarm-buoyfor which Letters Patent of the United States, No. 116,152, were granted to me June 2, 1871, as represented in Figure 5 of the drawings annexed to said Letters Patent.

As in the case of the buoy represented and described in my said former patent, this buoy is designed to be anchored in the water at any point where a signal-buoy is required, so that it will float, and will be caused to rise and fall by the waves, and when rising will draw in air by suction, and when falling the air will be expelled by the pressure of the water through apwhistle or trumpet, making a loud noise. f

In the accompanying dra-wings, Figure lrepresents a vertical section of the buoy on au angular line a: x, as shown in Fig. 2. Fig. 2 is a plan'view of the top plate or cap marked C in' Fig. 1. Fig. 3 is a top view of an adjustable diaphragm marked D in Fig. 1. Fig. 4 is an end view of the lower end of the central pipe marked B in Fig. ,1, and Fig. 5 is a vertical cross-section of the cap-plate marked G in Fig. 1.

A is the buoy proper, consisting of a hollow shell of sheet-copper or other suitablemetal, and a is a mau-hole therein. B is a pipe extending centrally down through the shell A, and may vary in length according to the depth of the water in which the buoy is used. C is a cap-plate covering the upper end of said pipe, having a central hole through which au air-pipe, C', passes, having a whistle or trumpet, c, at its upperend. Said capplate has also two induction air holes, c', through it, or it may have but one. The lower end of said air-pipe C is attached to an adjustable diaphragm, (shown in vertical section in line y y, Fig. 3,) which is movable up and down in the pipe B, and may be fixed at y any point therein by a set-screw, s, Fig. 2. At the lower end of said air-pipe C' I have ls'howna ball-valve, ELrff "'Safdadjusbile diaphragm;

One valve, however, would answer the purpose. Two guide-rods,d d, attached to the movable diaphragm D, extend up through the cap-plate C, and may be fixed at any point by set-screws s s', Fig. 2. VThe object of said adjustable diaphragm is to so limit the airchamber between the surface of the Water in the pipe B and the air-exit port to the whistle, that at each sinking of the buoy all or nearly all of the air in said chamber shall be expelled; and it is made adjustable, in order that it may be readily moved and liixed at any point in said pipe B that may be found most suitable to its operation. It will be seen, also, l that by removing the cap C said diaphragm' and all its attachments may be withdrawn entirely from the pipe B, for the purpose of repair. Said diaphragm is provided with a packing to render it air-tight.

Instead of said adjustable diaphragm, however, the same ei'ect maybe produced by fixing the air-pipe C" permanently in the capplate C, and also locating the inlet air-valves fv c in said cap-plate, as shown in Fig. 5, and employing a iloating piston,P, of such Weight that it vwill rise above the surface of the water, so as to limit the air-chamber between it and the cap-plate to any dimensions desired. lhus it will be seen that when the adjustable diaphragm is used the oatiug piston will be unnecessary, and when the oating piston is used the adjustable diaphragm will be unnecessary; but both may be used together by proper adjustment forthat purpose. I construct said piston P of sheet-copper or other suitable metal, in the form of a cylindrical shell, closed air-tight at both ends, and having a packing around it to make it fit the pipe B water-tight, but yet allow it to slide freely therein. In the drawing it is shown in vertical section on one side of the line z z, and

in elevation on the other sidevof said line. I have shown the lower end made concave; bnt this is not essential.

Risa rudder or vane at the lower end of the pipe B, which will prevent the buoy from turning, except as the under-current changes its course. This is placed low down in the water, so that it shall not be aected by the wind, or by the surface-currents produced by the wind. R is an indicator, mounted on a sta' fixed firmly to the cap-plate C, to show the ldirection in which the under-current is running. T is the anchor-chain.

Having thus fully described my invention, and explained its several modes of operation, what I claim as new, and desire rto claim by Letters Patent,vis g.

ll. In combination with the' hollow shell A, central pipe B, and cap C, the adjustable diaphragm D, carrying the airpipe C and whistle or trumpet c,` constructed and arranged to operate substantially as described.

2. In combination with the hollow shell A, central pipe'B,`and cap C, containing inlet air'- valves, and carrying a whistle or trumpet mounted on a permanently-fixed air-conducting pipe, as described, I claim the floating piston P, constructed and arranged to operate substantially as set forth.

3. In combination with the hollow shell A, central rpipe B, and cap C, I claim both the adjustable diaphragm D and lche iioating piston P. arranged as shown in Fig. 1.

4..,In combination withthe hollow shell A and central pipe B, the rudder or vane R and indicator R', substantially as and for the purpose described.

In testimony that I claim the foregoing I have hereunto set my hand inthe presence of the subscribing witnesses.`

y S. G. CABELL. Witnesses:

ALBERT H. NoRRIs, J AMES A. RUTHERFORD. 

